DC-DC Charger, 11-16V In, 13.8/14.2v Out

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Family_Dog
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Sat Nov 03, 2012 7:40 pm

(I have split this topic from the orignal "Gifts" thread)


We've been testing a small DC-DC charger over the last few months, can be set for either 13.8v or 14.2v. This unit charges at 4.5A (we have maxed it at 6A in tests) but do you really need more than that? It has to be wired through the ACC point on your ignition switch so that it switches off with the ignition off but the price is righ.

Voltage output is set at a constant 13.8 (or 14.2v - not user-selectable) irrespective of an input variation of from 11 - 16v DC.

The unit is small and compact. Unfortunately I do not have pictures of the unit on my home PC so will only post pics on Monday.

PRICE: R890.00 with Couier or Speed Services delivery at R75.00.


-F_D
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Sun Nov 04, 2012 7:24 am

Hmmm, can't wait for that price they'll sell like hot cookies. So you reckon 6A is more than enough?
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Sun Nov 04, 2012 9:25 am

Family_Dog wrote:> dc/dc charger 25A please

We've been testing a small DC-DC charger over the last few months, can be set for either 13.8v or 14.2v. This unit charges at 4.5A (we have maxed it at 6A in tests) but do you really need more than that? It has to be wired through the ACC point on your ignition switch so that it switches off with the ignition off but the price is right - probably around R880 or so, depending on what the landed costs of the new shipment is.

Voltage output is set at a constant 13.8 (or 14.2 - not selectable) irrespective of an input variation of from 11 - 16v DC.

The unit is small and compact. Unfortunately I do not have pictures of the unit on my home PC so will only post pics on Monday.


-F_D
Erik please keep us posted on this. :)

Would this unit be able to handle BOTH Alternator AND Solar input ?? I want to totally automate the charging system ? (that would be about an 80W panel, for those amps ??)

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Sun Nov 04, 2012 11:31 am

Following this thread with keen interest :cooldude:
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Sun Nov 04, 2012 12:20 pm

I think when on a trip, 4.5A would be plenty to keep your battery fully charged. It equates roughly to the current drawn by a fridge, which, of course, is not constantly on.

Chris, it only has one input suitable for 11-16v DC. An unregulated SP could shoot up to 19V off load. I think we did simulate a 19v DC input, will have to check on what the results were.


-F_D
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Sun Nov 04, 2012 2:59 pm

Erik I am sure there is a massive market for this unit.

I am looking for something that can do about 8 A dc-dc charging - less than 10% of the battery capacity, but with the higher voltage it should give a good charge. And then also be able to handle about a 100W Solar panel.

For the normal trips we do the dc-dc will be more than enough.


BUT, doing two weeks in the Kgalagadi/Namibia you NEED slightly higher charge rate, AND the solar input.


Still I dont like the 20A charge rate of the unit currently in the market place

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Sun Nov 04, 2012 6:22 pm

How would you connect this system in conjunction with a split charger or do you connect it completely different.

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Sun Nov 04, 2012 7:23 pm

We've not considered this possibility yet, we were just testing the unit directly onto a second battery permanently to see what would happen. The amperage is probably a bit low for a split-charging installation, which ideally would prefer a higher charge rate before disconnecting same. The one we are playing with will not over-charge a battery but bring it up to spec and then 'float charge' it.

Basically, the idea is to offer a secondary battery charging system with no frills, yet remain cost-effective and efficient. No heavy cabling is required or the wiring either as it uses approximately the same current as a single 55w headlight globe.


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Sun Nov 04, 2012 8:03 pm

Will keep my eye on further developments and definately consider the dc-dc option. Please keep us posted. :thumbup:

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Mon Nov 05, 2012 8:33 am

Now i am interested to see this charger as i think it will suite my needs....

Keep us updated please and some pics too please.... :beg:
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Ek hou julle dop, kan ook nie wag nie :thumbup:
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Mon Nov 05, 2012 7:31 pm

I couldn't find the pics on my work PC! :(

I have asked Wilma, my official photographer, to check on her camera when she gets home tonight, otherwise we'll take new ones.


F-D


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Mon Nov 05, 2012 7:34 pm

Eric just a thought ...

can one use TWO of these in parallel ?

one as the classic dc-dc charger, the other as the solar charger ...

I know the open circuit voltage of the solar panel can be higher. but as a permanent connection .... maybe it can work ....

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Mon Nov 05, 2012 8:09 pm

Chris, I had a chat with my business partner, Junior, today. He is going to develop an add-on circuit to accommodate Solar Panels. I have ordered stock, as soon as they arrive (hopefully in time), we will send one to you for testing purposes.


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Tue Nov 06, 2012 8:42 am

I'll definitely be interested in one of these. Keep us posted, please!
Are we there yet?

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Tue Nov 06, 2012 10:20 am

Senyetse wrote:I'll definitely be interested in one of these. Keep us posted, please!
Me 2......... :thumbup: :thumbup:
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Tue Nov 06, 2012 10:57 am

Ek will ook een he sodra Hull beskikbaar is thx
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Tue Nov 06, 2012 2:20 pm

FEATURES:

• Isolated Ground
• 11-16V DC Input, constant 13.5v DC Output
• Light Aluminium Casing
• Dust & Moisture resistant construction
• Input Under- & Over- Voltage Regulation
• Short-Circuit & Overload protection by Constant Current
• Over-temperature Protection
• Reverse Polarity Protection
• LED Indicators of Operation & Fault Status (Green LED: Operate. Red LED: Fault
• Maximum Operating Temperature: 40°C
• Continuous Output Current: 4.5A, Maximum of 6A for 30 Minutes.
• Size: 77 x 75 x 32mm



Photos of the actual unit...

Top
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IMG_8988.JPG (29.73 KiB) Viewed 4679 times

Bottom
IMG_8993.JPG
IMG_8993.JPG (28.79 KiB) Viewed 4679 times

Base Plate
IMG_8996.JPG
Base Plate
IMG_8996.JPG (36.85 KiB) Viewed 4679 times

-F_D
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Tue Nov 06, 2012 5:17 pm

Eric
Is this in oppostion to that extremely expensive c-tek unit?

Last I looked it was about R4000.00
Wishing my life away till the next trip!

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Tue Nov 06, 2012 5:27 pm

Eric now I will "have to" do Namib in December ... the things I do for my club .... :)



Can wire it such that I can reactivate the original system by replacing a single fuse ....


PS - good chance we are doing Namib, just waiting to confirm a few details.

PPS - Ian that "expensive Ctek" unit offers the additional solar input that I was discussing with Eric. Only issue I have with that unit is the extremely HIGH charging rate. THAT unit with an adjustable charging current would truly be the market leader !! 10% of the battery capacity as the maximum charging rate, for normal application, ie about 9 A for a 105Ah battery. But in an emergency boost this to 15 or 20A, then default back to the 9 to 10A.

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Tue Nov 06, 2012 5:29 pm

I,m in for one Eric :thumbup:

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Tue Nov 06, 2012 7:23 pm

It's not really opposition to the C-Tek, more of an alternative. We have ordered units but I have not yet had any indication when they are arriving, hope it is soon. I was under the impression there was local stock but seems this was not the case. The unit is primarily designed to supply a constant 13.8v to a device rather than as a battery charger, but it works well at this. During one of the tests we performed on the unit we left a 100W globe (rated at 100W, but I doubt it was much more than 70W) burning on the unit for over two hours and the unit was just running above ambient temperature during this time.


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Tue Nov 06, 2012 7:33 pm

Eric this unit is just what we all could do with...

How much is it and can you put me down for one unit please....
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Tue Nov 06, 2012 8:05 pm

Eric, i'll also be interested with the solar board ekstra... let us know when you have stock of both.
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Sat Nov 17, 2012 4:41 pm

Guys, still waiting for the stock to arrive. But it seems we have done all the test on these units only to hear it might be a different model that is arriving. It seems it might be a more powerful unit too but can only confirm all this once they arrive.


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Thu Dec 13, 2012 8:16 am

Eric

Has your stock arrived yet?

:?:
Thanks
Wishing my life away till the next trip!

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Fri Dec 14, 2012 5:20 pm

5) Is the "External Control Wire" connected to the ACC point on your ignition switch so that it switches off with the ignition?


Ian, I have now tested this function, and you can indeed control the charger by either making use of a separate switch (apply +12v to the sensor wire) or by connecting it up to the ACC connection of the Ignition switch.



-F_D
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Tue Dec 18, 2012 7:53 am

Eric
Thank you.
Wishing my life away till the next trip!

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Wed May 15, 2013 10:46 am

To revive this old thread, I have received the good news that our stock of these units have finally arrived in the country. We should have them available early next week. To recap: The standard output voltage is 13.5v DC at a current of 4.5A nominal but 6A peak. The input voltage range is 10-16v DC. This is ideal for a High Cycle (standard automotive) battery. We will be supplying some units for use with a 14.2-14.4v DC output for Deep Cycle batteries.

The unit thus dopes not require very heavy duty wiring between it and the batteries, due to the fairly low amperage involved. The unit is affordable at R895.00 plus courier/postage of R65.00 to most SA destinations.


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Wed May 15, 2013 11:06 am

Eric... the other unit I am testing has been working faultlessly so far. I know it's a different unit but the same concept :thumbup: :thumbup:
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Sun Jul 28, 2013 10:25 am

These units are now in stock. To keep the system simple, they are not suitable for Solar Panel input, although one can connect a SP regulator to them. They have a nominal voltage output of 13.5v DC, we find this a bit low so we will convert them to any single voltage that you want, between 13.5 to 14.8v DC or whatever. This requires electronic engineering which we will do an a "per order" basis and the out will be fixed at only that voltage, we will not make it variable.

The idea is to provide a simple easy to use, easy to install unit without extra frills adding to the cost of the unit.

So... if you would like one, please state the required output voltage, which depends on the type of battery you wish to charge, i.e. 13.8v for a High Cycle, 14.2/14.4v for a Deep Cycle.

Price is R880 per each with delivery anywhere in SA at R65.00 per unit. Limited stock available.


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Mon May 25, 2015 1:31 pm

Eric do you still sell these?
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Mon May 25, 2015 5:13 pm

We still have about 40 of them. I have never pushed them because we modify them to work as DC-DC chargers, with either 13.8v or 14.2v DC output. Essentially, they were designed as constant voltage power supplies running at around 4.5A but we have tried running a small 12v fridge (Waeco 11 litre) from one of them and it worked fine. Doubt it would run a bigger fridge though, haven't tried that.


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Tue May 26, 2015 8:17 pm

Eric, please explain the change that must be done to run solar as well. You know, in "land crab" terms.
Not all those who wander are lost!

Scout motto:be prepared....
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Family_Dog
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Tue May 26, 2015 9:10 pm

Neil, it will not work with Solar Panels. On a bright sunny day, a SP can run up to 21-22v DC output with no load connected to it, this unit was designed as an automotive constant voltage supply with an input varying between 11 - 16v, which it does very well.

Although it is rated at 4,5A average, we did squeeze up to 6A out of it but it is not designed to do that long-term.


-F_D
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Thunder02
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Wed May 27, 2015 2:47 pm

Family_Dog wrote:Neil, it will not work with Solar Panels. On a bright sunny day, a SP can run up to 21-22v DC output with no load connected to it, this unit was designed as an automotive constant voltage supply with an input varying between 11 - 16v, which it does very well.

Although it is rated at 4,5A average, we did squeeze up to 6A out of it but it is not designed to do that long-term.


-F_D
Thanks Eric.
Not all those who wander are lost!

Scout motto:be prepared....
www.4x4direct.co.za
Email: boksburg@4x4direct.co.za
IFS is like a swambo, soft, sexy and expensive!

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